% TIPS
% \substack{a\\b} for multiple lines text





\usepackage{amsthm}
\usepackage{amsmath}
%\usepackage{unicode-math}
%

%\usepackage{,  , }
\usepackage{amsfonts}
\usepackage{amssymb}

%\newcounter{dummy} \numberwithin{dummy}{section}
\newtheorem{dummy}{Dummy}[section]
\theoremstyle{definition}
\newtheorem{definition}{Definition}[dummy]
\newtheorem{corollary}{Corollary}[dummy]
\newtheorem{lemma}{Lemma}[dummy]
\newtheorem{proposition}{Proposition}[dummy]
\newtheorem{theorem}{Theorem}[dummy]
\theoremstyle{definition}
\newtheorem{example}{Example}[dummy]
\theoremstyle{remark}
\newtheorem*{remark}{Remark}


% Roman numerals
\makeatletter
\newcommand*{\rom}[1]{\expandafter\@slowromancap\romannumeral #1@}
\makeatother

\def \lb {\left\{}
\def \rb {\right\}}
